Swift - 从 avaudioPCMbuffer 到数组

Question

是否可以将缓冲区中的数据提取为数组？我已将音频文件保存到缓冲区中，现在想提取数据。代码是:

import UIKit
import AVFoundation

//importing audio

let audioFileURL = Bundle.main.url(forResource: "Morning", withExtension: "wav")

let audioFile = try AVAudioFile(forReading: audioFileURL!)



//extract information

var audioFileFormat = audioFile.fileFormat

var audioFilePFormat = audioFile.processingFormat

var audioFileLength = audioFile.length

var audioFrameCount = UInt32(audioFile.length)

var audioFileChannels = audioFile.fileFormat.channelCount

var audioFileSamplingRate = audioFile.fileFormat.sampleRate



// insert into buffer

let audioBuffer = AVAudioPCMBuffer(pcmFormat: audioFilePFormat, frameCapacity: AVAudioFrameCount(audioFileLength)) 

try audioFile.read(into: audioBuffer, frameCount: AVAudioFrameCount(audioFileLength))

Answer 1

你可以这样做:

let channelData = audioBuffer.floatChannelData![0]
let arr = Array(UnsafeBufferPointer(start:channelData, count: Int(audioFileLength)))